RedMax AN-100U, User Manual, Page: 63 / 106

Red MAX
™
Base Station
user manual
Doc. #70-00058-01-01-DRAFT Proprietary Redline Communications © 2006 November 29, 2006
Page 63 of 106
the binary exponent of the number of 'opportunities' to wait before responding to a base
station registration poll or a bandwidth request opportunity.
It is recommended that you do not change the Backoff values. These are very sensitive
settings, and can severely impact the performance of your wireless link. If you have
accidentally changed them, Click Default button in the Advanced Config menu to restore
the original settings.
Ranging Backoff Start : Enter the starting backoff window size for initial ranging
contention.
Ranging Backoff End : Enter the final backoff window size for initial ranging
contention.
Request Backoff Start : Enter the starting backoff window size for contention during
bandwidth requests.
Request Backoff End : Enter the final backoff window size for contention during
bandwidth requests.
Save : Click Save to save and apply the current settings. Changes to settings marked
with a red asterisk ( * ) are effective only after clicking the Save button and resetting the
terminal.
Cancel : Click Cancel to discard all changes and return to the main screen.
Default : Click Default to set all settings to the factory default settings.
Example: Backoff Settings
When a subscriber detects a collision during a registration attempt, the subscriber will use
a retry strategy to avoid repeating the collision. Consider the effects of the following
settings:
Ranging Backoff Start = 2
Ranging Backoff end = 4
Following a collision, the subscriber will skip between zero and four registration
opportunities (2
Ranging Backoff Start
). If the subscriber detects a collision during the retry, it
will skip a random number, between zero and eight registration opportunities (2
Ranging
Backoff Start+1
). If a third collision is experienced, the subscriber will skip between zero and
sixteen registration opportunities (2
Ranging Backoff End
). If a fourth collision is detected, the
process repeats as for the first detected collision.